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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fe1158c717eb015cc3606f7328b3a7839e4c8c1a91e167a5b933a43bc01a71' 
  AND token = '+MXUgusqpXzt0KI47DiDfQkZZhQLkpEaHJlK2Nz5T6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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