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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe27cd394b63629f36423fa411f56a262c620888a5dc2241851cf8f89b6f884' 
  AND token = '5IV0KzGr2UO/wzLAF2tU7QofmibcYlaXZuavYI7ek60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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