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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74a6664fad6249472fe9e00a6af3d9a4f69d69bf06ea0dc0f3dc74651fabeac' 
  AND token = 'wSrWWZDxVprb9h0D399mmUVvSle1GOxfTMiwffZokH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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