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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f04502caa9b90926b312724f35ddab86d4f2dc6a9a4b88c216d2e656656eef9' 
  AND token = '5YTdfFRxloTYbpB2aqwLjpg7hF5daX/joDdEN4Mh3zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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