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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f6057d222d30291ed250d82c4b4acab873858b44c7a6c18ba0658d532442d3' 
  AND token = 'vCi+Z8L2JrwBDtsRv46aWWpTYtfhutE/MVtEHWXy5qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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