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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da45edd84c95bf219c29320d74e65bdbe490a27f618d6c6c7ba57edc67deb83f' 
  AND token = '7RobyyEUfAnbQ2yl4TdWhUifKyyZbPnMoJ6v83MpZYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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