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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfa3300ef83e486302d2ddb24ae963575cdd7df659cb719ae11ce7b1438f8f7' 
  AND token = 'bwyb4e2yiVdg1HM17Lbcvy6zh01z1PZWk6K7hzrzvOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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