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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe62512c93f5d94c2e0bd1dbbcd93f9af5558cf59154a4e3de72dbe4fae1e3bb' 
  AND token = 'P/6o6NKbe7nEfzDo/hwFfwdF8R5heYFIeN9n1WqFXMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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