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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b98eecce300a3f1d89f0d33d91134fe8fb552e11efd6cb1fd7799d7302d582' 
  AND token = 'cey3KsALqj+3FEVCE5C45qCXoEDZ5evveL/z8glvRoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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