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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd396721822de6dfded6c58c21e65c611e87865c357df6789e484af43742b0ddf' 
  AND token = 'A0fCbRB0zZgvsn68A/Ll8UX263utigbXsrckwa0blJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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