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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c3384c2a9eb7dd5d35ca842a8cfe11166dc3e3d0fe7ad212129e75518fe1f2' 
  AND token = 'VGt0AfNHt3K8jfzl9nZ43mbNOLa/nncW06IWGUaJie8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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