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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf3a8dddc549072a8223156bda651b6234947c8f65b8b57a56ed6db172c7d7d' 
  AND token = 'iZBJi3hqY73FnBuSdQRyJpBR7bbYfm60Zv4+YmneTA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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