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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0134912a7b20b41a6c654a646ba041d63d9530ccf5342d7c9ce110d4122cd8bb' 
  AND token = 'vqwW4ndPQznqxRMoq4MxJQx8BIfDQtkFv0TKLv8Fe/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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