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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0f93ca700a07fadcac6d877588894f6eba8de6b2f1318ee6e96f42fd87f31f' 
  AND token = 'WuWIwm/cjxixbES3YTnjSfLnzIPuwovp+CAx3jb9Ah8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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