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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab2b839a0d9c465faaa78b727e83dcdcb75468af171b73f61238ee000eaeaca' 
  AND token = 'NnL9y9QLQzHPU0xatGjI67PVc5vaS/fRGHk7cnV3+DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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