SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978622bf83b44c8592b1fcdd02ca2f93420f1d34c8fea49704133d9eb1d9f87f' 
  AND token = 'ToQkOav7pnCFPtT7Q9bvjzH6YPYuPTFWp/UxBZjBJL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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