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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68315b53f220e57e7bd9e0740e1b2fd41f695fbe72cb952668c43ea822690bf' 
  AND token = 'Dk7pzb9Jme8uxmbR8wkXlXQSXer4mx1ZNfw6/VZKNoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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