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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d776044ac989c89011b3f97d12ceef9ed8147a973cb48dac77c9af4e55660c' 
  AND token = 'sqwh8HAc0ZnTnsAdPP6I8eAWjz506c7gweK/i1DGvjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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