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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2f94f37ce3746eea5c13f71ffda548617dcbb93f61aa164292f17f165bd553' 
  AND token = 'GEDnhSkfp4jTx9wPCb6gf5aS0iQ5fIcwxDdQ4MmAAjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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