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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482850850bc586132c268174758b31c8e7f759197a43d8bb8c7062c1f746fd23' 
  AND token = 'x1aeciz02W/AsBZOUHKSMdJ2pBXK0jxG+plok+L8/6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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