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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9439035da3650ef03fb24d4202604d73f45da5e75db4dd4eb3f9087d49c2354' 
  AND token = 'aK70QwFDqleUpDMMK/7Eh6oE/fHlyFufJo9DWz6oNpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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