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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8667ffc7d978a4999c72301cf6d2be21068ea5fff87ce42d0ea9c54f66e0edc0' 
  AND token = 'ELzQokMYliHjO4OyCwbqOVWajY/Y2OLLdo39UDJYHtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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