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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3bc7964df8139347e90d97183601218fc06076300ea3e8e4ad86acf228c335' 
  AND token = '8fyjLrnlopklHBSYxsVjkUHWPw9/Siwy34fPXg2r98w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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