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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3cba3fc149d6d209848cf1d7ca305539fd772c388daff58d2876967760b880' 
  AND token = 'bgIh5LT3Xt6gfoLkd3ka3FTO3m9Rl5cIyfnDjiNBmJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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