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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11dff8eb5bfb19d4f031bfe4af4adb6b40eb88abdf9b5c567357079f4df2e147' 
  AND token = 'ExJQfY8ScYQnMnEHHLQHgwEcQeeasvm2mab5oof7dqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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