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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11f75d9447c3f31590a81aaa7d2ac3fe5bca8b3ee1a873e28c590ce660d29ff' 
  AND token = 'B6FAOIPSx3AtnuiqAJhrOpXWPG1K6Msq7gjtoveX0Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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