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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf11ab0ea94f058657af18f033b6d3a9cb91e584fa72e3481a36ccb65e882cf' 
  AND token = 'lvFhwaDfh8uP82YkO5PHJ1BbBxtXmQqWqr7TXErg0IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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