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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ded664e27160410cd7d5c85f8449f0bf51a949da575dd4183d1245e3eea46d' 
  AND token = 'wqdtcpHC1Fmss/cKTafzTApQRsJbQA2U4RcfKF/vHYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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