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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baeceea9d1594240b719cb032f9a8874b0390b1b8e0f23afe4fff6d999119ad8' 
  AND token = 'VWGb5VtzEij9WFiQQVOw67A420Xb1RhDAipBnoeUXsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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