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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52b2faed9b1bedad5349f5452e738a5cb5db1e8b9dabf8053bd1876c078a0c1' 
  AND token = 'qhn86EYu8UIb8AWnFotftLSnI6/fEDwn5HFPXxKlybQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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