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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd95781cc361b6fb5ac578fad7f36c7eeb58347078cc185fd34139577f1194f' 
  AND token = '4C3M6We6qvsZYo7gcATaKnqYx6g/Dd1FTnrIJP8XJLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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