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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cfaddf6599d8acefe00a4cda0d90d9923953e072e3ca51467281ca944b7a85c' 
  AND token = 'OEQ7HKE5OsL5S6CM6lpJFBogGegUy5pfxF6YuD7nHl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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