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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b709e16cb158338de79089aee45879855229c3e0965b8bfcb4641b4bd829733f' 
  AND token = 'DjJOcMRY7t5srFcU89/OFqMgnWw8JsEpOiIb7WIUAzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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