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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60ee6f482a3cc715f416b39a525698e71d97fea31be53d694364ff7d8aa0c72' 
  AND token = 'sGAkmOeFCVNcLIgEVG9jk2dBRalM5K/EraPh45EMNK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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