SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2013e4f1e3c217ffbcb6096772508d2d3b8654cdf87637ce3572f3f19ecfe56' 
  AND token = 'jpXSijJJQQ1MFVvtMegWMuVvDKzKfIcB7YFYXVcLtwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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