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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24552262c67505c3a86baa3c8ba9d1b20b8c64e652d915ec5bbcded2a51ce676' 
  AND token = 'CYiJvLT/4yI6dKGlxI3HxZPkeBODEJdcv0OxhppE/Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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