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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979af9bbb53580ff3777a8c3e3abfa758b588202e4745d98c37525e07bbc018f' 
  AND token = 'UgIjxcyJ7fGUCULCQElrmmHlREvKfSms9e8LfpzjorI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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