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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec65e96dec8a24fe68320ceb4864342e94a1416819d53dc7821b0b61cb1b4c6' 
  AND token = '2jpNACGO3e5O/cRK7nfHyhZoKxg/clHNSu+Qq9QWgnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}