Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408ccf2be8d1d3678e6fc45762eb7a4325984dfdceb23d1c9b1376aafc92a96b' 
  AND token = 'TIuucT2vZjFP5SBuSw1N00SaFspUkAxdutgNb62+/s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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