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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a4ab8f421fc7383d60390ed9224eeae910c2325728da8c2c13d4d741bae5b3' 
  AND token = 'jpX4f9S3f6Jy/oYGu++poYw51Rau2qb8qrEM3nd+bkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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