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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ee5d7082c10ec6acca8aa9cab7c5582aed2b5844b24ff7edec95eec6b8ef50' 
  AND token = 'Gyy1mz9Wq8fa5fvsOioqKMyHhFN0Hp0loyqnNWXutvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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