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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4641cb3b47f471df7778eaf1808442ba3eb9268220f97270d7296391a63058f' 
  AND token = 'H3LfAdaKSGZ5Wn72SuWsTu/5bQ8QZKhUSO3Oh0NtwxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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