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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0115206ba990c3878d9f19fd885a1effbcced13a3c3d799b3c090959eda2bec4' 
  AND token = 'qS7EJNSH24ZY44+1HXOw9WsHLMG00DkHBellr+epqcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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