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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becd2a180b927ab1757469c3334a3054d9e98d480602b5e287b1aa7b7ddac5d6' 
  AND token = 'IBm41AY6p7poXPcKmqHuSYEMf4EsIlQ0Y7IWxzL392A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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