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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d03ab29e9ad8ca4c1c8f148d6981bda013246b1bf3c8a43fb729b068b8b698' 
  AND token = 'Q0pnlcLfVv2rKP+qZ4e8u9mcc1UiihceGdokEIJaf+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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