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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a789001a9222bdb445589521d6d751a61d63eaea8c43b8ad2c3dcadc2cb56d19' 
  AND token = '5HtdLM+STk7KKtdJhdwa7e/VD8haHQi5vfD2p0CO31s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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