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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b286f3e48b9eeade104c1cce995c8b51f2f09bc6d193957322b6341ebc650f' 
  AND token = '9ynh+sMXXl99ddYn8XAkckmTD4qGvkYGDdfiRoe9xaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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