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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0da67c396afee914d69f4c63c44a1c85caae961f5486a6d0602c691d6b2737' 
  AND token = 'fzrYi0N0kFJkrBHaReXDBf54CWk0hCN97X9zFv8tKSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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