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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bb96e6eb532b53caef6dcedc16e5d4c82344ed986ee43683ab52e781e91f56' 
  AND token = 'jrsT5C4HFWIRjhqjJjaX7KlC9H2ZUAvnKdy97niyh4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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