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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866e65fcaf03fd9898e884d8949aee23a4be53e84b68113716967cc3395bd10a' 
  AND token = 'mUABBA6jVfP4paDbx3s3MwbC4fInwKmKqyU62YSBbYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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