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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97954941ba898bf19784d11299e92cedca3f1b6db5f78866b87d85f10ffa29a' 
  AND token = 'LyujNRa0LjMIvazkBUzdDBruW2Bq0tpjkR6d+xibAww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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