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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c061794bbf6f8b8f065ec0c7abf42436f4a98af8186552677258a65ba9eccb2e' 
  AND token = 'i05aKWqvw5pwIdbQJ7K/RPkdyF7wq36jrSoH5SzFse8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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