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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a0227fd8fff277016c60aaf7e9c00f61a8bc09d5cd53b6d7fd707b70c8db0d' 
  AND token = 'Iu9RaWHxXk3N9spwlGEV4hGwJ0kxangNLxreElpy8l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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