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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9962b9a7ab4afac3bdd4b82fa048a8d1a74ca8cfc5824a7e324e195c6e46415' 
  AND token = 'bzXHIfRkWOM4YQIt9e8eBZRqiix9LzLq4oNDaINcNyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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