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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b689b29621cd3678996f27ead30336d7f94282a0c0309df5a480083833a9b8' 
  AND token = 'e+3BwP1eiBF5X/t8CC7MqSf/bnvGY0PufhpPvNsH1vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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