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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb14295e9dd22aac5817c1c9f1b1d3a617ab98796ba64cc3fa2357ab4a853ad' 
  AND token = 'UDri7hzHztg//kbYRBrqCE6Bl19LMOWQ85kKY7xHqU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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