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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a930c32ffe2b044213f46e1dbc13754e2402caf5d656c1843d4c522fa78a32' 
  AND token = '/eNfUVxsfpHSlmFFvpr976v6tpgxPdEnE0ck52zcRPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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