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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0cce63d10be4c5c4675eff0f6e8e62c0698bc3776f45e1f729059d160fd1fe' 
  AND token = 'Ug1gPZLBFk8XiURCeD9xuglIjR7fGXUMBiZtP4BRYUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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