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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776b494e3edc3f14846562afa6df9227733ab25768ad9ae2ae96938be99385fd' 
  AND token = 'zHfwrWWWnVkeA7MQ8ySNHGAoAG0Y1ELIgA9on052hJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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