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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8814f55898c1b8fa5f4f7ea0ff38d057f2e8cd2752d45a7c0596f96d45fa297' 
  AND token = 'nFwYeQr5AfjVTucD0fC32r6cYq9TARrmwrPVrQwyJdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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