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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf99c45f3c3de18f96f77935fc0e42e7cb0356f48e699e6afe43a52fefd9812c' 
  AND token = 'BKtKXb6kJHLj251fFNqduzNQnhN6HTC1EadwLiV2wlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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