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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bfd57bf0b4ba7a344974b61ecd82fdb4a65b1b6610c937fdc393537b654980e' 
  AND token = '7YeMM/Je9DTb4hvnuzvskiSFaXItgZdg2p9Ux1jaUy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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