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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d182a9c386545963b61638de7b6b4b09b30b25c89af66c8963c00d55402dd3' 
  AND token = 'bZ4kmmtA0VzxkUi+O7lHVqwVROvp1ZcGsxwy+kPSQPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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