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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693c458496cea27862d68751296471250e3ae07d0a4eedb38e0c3a06615f3228' 
  AND token = 'ArIsIBKFjIea9IApNcQmg/BOmCab4k4y16FIMN3nsyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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