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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e00ebe73b9a665e569026e9f2b7fe0508bd3e1efc1280d8802582131aa4fb0' 
  AND token = 'WAJ2z+nvQ193DMtMfktJe49TsLyK8sQK67fPKfqeFiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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