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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9a4acd2b50eea5b489f03e0f61debe5933cff8850f1c8fc42ec635c1fc23ad' 
  AND token = 'xjsvD9srYFcSpoB/ScWmXkEP92VgcwWZOgcMgm4Iw5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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