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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf4cc7db486035f11dedaa7d76fffad3bb25b9aa75bba528c0d78712f388c2d' 
  AND token = 'oaIZ3h5lFKfG97aFC8522N5MrgY84XVhr7rQcR201nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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