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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db0f90952d3627d9cbe9cc3c356ef5d078525196f02fff9025fcbd243e00574' 
  AND token = '6hF3vnuau8/vKUCRBuk8ETL8j55NPwi6L91OEqLxKBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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