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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ecfb0212e0268984a09495d39cc5a840b8fd64a00f5cd8da104aab6de651340' 
  AND token = 'u9AU40/mdnnpnl27hOpyEBdvt1g4fGSpoNvs0wV5LL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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