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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237963b4509e1f5b431eed1f9005fa9333d6719ec7bb604d7d83444271eecffe' 
  AND token = 'T6hIHa6uHIztymHobdx5qpNq/VWqoaxwl9jdjKaNp3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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