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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae855d9190a4577969edb289c3b1065d6ec1682d59a3fe14a61c06181fdaa120' 
  AND token = 'BJdyF/8N85w0VM5pRo7+tWIiL/ejY4RW61MM68o8Dsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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