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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a5ec032515a86bd630f9fdcc2f0c26fbeaeab7a2e9d33b635f58c461e1b610' 
  AND token = 'ZpcO1ATZ+FcC5OhwGL9ovqD7rZvsFWrIBJUF2Mb9uEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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