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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89782823570d7c59c50437db9ec55955fb7fbdfef7b788c07331e05f41f9467a' 
  AND token = '6VCswBS489+AVuoVC4sMKkuUn156EqkGR942rZ4cd+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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