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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23c33f80aee0feeeb58ef21fc308519b2033d070020b776869254628f9c37ee' 
  AND token = 'aQMQ54mKiSSzfU81aUJYSgT2KM8EKG1nCRetkQA42vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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