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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613f61c9de704c3fef1abecf4b310d289d6add79cc96bcbbe69522e22a857520' 
  AND token = 'uzDbNrC66D4IWJlyVrWcnmukpvUpAa3BZPl65+IeKlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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