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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77475f0de86dd9dd1de7cac9b71e5911c9e72f4fdbc77f28bca861539ae75d41' 
  AND token = 'BN1EvLu1OmtvZjuzPGL6Qp/byVn8Xyu8tVBoEXx/cb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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