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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4beaa48e8678b3dca8db743294d96f1b01ace6c3df762ca8e4310cd356585481' 
  AND token = '+g9bmL7+RgM+140pdLGOZl3ThxQqT942BpciGtJER9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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