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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2897e32f4da0ea3d5da199d23f2654f550c49ddb01540c0d288fd5904965cdc7' 
  AND token = '9KXpONybJoQNtg8RLL9LUsl9LRXVzzU9G2gDGhlDG6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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