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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf47c7c9f7c6e7504bd1793e4e93a4deafc3ccbc1c75d5c889e4e7de27931b50' 
  AND token = 'o8Gk03HxXs5RzxLTxHdfiXdD5itZuwva3Y4e3EMl9/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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