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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f83108e309679879a14c512bb04425439226e17aa2e956801da2013d7ae7364' 
  AND token = 'M6DkJd70yf68SoTR7Z9l9yw0tvvM8kv5LKMCYJyrQPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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