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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2507bae1f1bc216f7eb223b8a5e9d9a122cf6367c642c9a0fc927c1996b6d09a' 
  AND token = '9SXFKwGaFz8gaQljd3Mcdxn3Wunpm+UgoyEXS3sEXDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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