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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6704d6413ff26549f37d5ed54befbe2d5e314bcce1fd2b3f93762265cf1e61a' 
  AND token = 'm9EAYTu2MxIchZs5T8slm9Lud+e6hqihZsvOG7a5E7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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