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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3d8b6c5cc340e55e05004ab1fb052c76439f21f5c91c8e22a08671a25fd575' 
  AND token = 'ExzieCaVtrcPJ4PPU37feXqVIb62ZYdNU9UZRNYouxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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