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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16110cbb8812ff081d066a6a514c81a9d31ac8da57149013d858e04d1438dc96' 
  AND token = 'zY0dyFbfK8jwJofMYhH4sJT8JE1eOau0HkYEAI5fyMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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