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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3a412f43d4c1d6ad646adb7cd6a0ba1413dbd07d22baa3492b26152df23af7' 
  AND token = 'Zu45JFN/8aBLIAv4v0HEgFz4Yk0rJ18p2vzHZjNIN3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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