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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4daf8a3b75dd56cfca182666b3fe7d3001fe51c580253fdd1a812732e9b312d8' 
  AND token = 'di+pdpx6IjW4iLWm2okFALzdFpiC8TDtu+K5+GVYR64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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