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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2d87bd0c0cd4a7fe385a7068431f3a6c17b4359a5969d67bda733b687e313a' 
  AND token = 'FeLGp1BOBwXF4qiVA/vj5LqPlItu3UOfeoneRNJbrrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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