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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad5694cf650b21984695bd3a5d46be60d24bc9d6ee4adfa4a07ad96e7dbc5dbf' 
  AND token = 'ZI3eozOWwtUAqUnMO0IugHrmigt4T5/S1BKtF8TdvR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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