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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178e1260f31b9927c757ccb87793a9566179c3d089bd213396be7d4e20d48afd' 
  AND token = '2+kA8UIwhAq1DlK6rlch2UUN8De9neKrHhGcxQDIPkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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