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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aec7bcbc536127bd55904d0f75acf17f0ebbaeb14b6c2a36a48afd44b06750b' 
  AND token = 'YjKltJkYwMwT4vtLQrc2tKaEG5v7LuuE6k7tynsGaWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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