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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c914083c9af955a52a8105ca182fcd88bf26bd1c3e16673ea139ba701b8eaa21' 
  AND token = 'wXn1IhfcbTjZ11Vsi1i6lWWXLq8hcpQdgiwni/PXlck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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