SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9baad4edabb19fd0848a67bf761b1b9e70d4708b1e9c6aee57d3c293aab9ce' 
  AND token = '1YqqQ6OwsGQeRzLLVhJHBnU3obY5VugZxLBRst9VRpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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