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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '288f447de5fd4be0fed3f160a65f751f0684e2c1d299bbdbb50d2ae5e1746db8' 
  AND token = '8otksDGRYlGZQRCB/KtFjBuC5XPu9URTK25fXlKyV2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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