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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e4be1fb793f445f8bb99c1edca74dc86b7cd39e4880996506afaa3e7bcdbff' 
  AND token = 'HrEuXlPzU+0bmV5/aE5Loz7IRB2ohAcx5Bq+kKPQ+DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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