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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6430123b7d039586ccc6ed2bc8ec98e82d6ed2d3e0c01877a855422d9720a36f' 
  AND token = 'D9Bqt67Yg4bATkamUZ+7Ts2bzkLXjLS9XulXIsJRcIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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