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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4cd3fd893ad66e588b5082b834cf0e8e5b26acf96a6351f3c29295bdb8b6b08' 
  AND token = 'JfShxyJZDlQC2h3FYw6tfqgvilAmStIk1oM39G6zmGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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