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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dece55e4136d9fd74d989969d4642bd784debc6e04fc77cd0c9ec4da3526bb9c' 
  AND token = 'C74kxE5ybDg+mu5eGaTrlWcGp/8Ntu1PxiRndy9jXXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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