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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9a3477de9dc70a0bc5be8267396919388f6f9002065894f47e3092714528bf' 
  AND token = 'AkYko0lOIabN4Gnh8DVcb9S4Jz8Q5erOgQ7LNP//ZDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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