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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '306780b367c046e5d2b4ce74dec90bc4cd4f11502b2b3d0676d71957ae4efb96' 
  AND token = 'xa9tAbV6+oad1eoOVZOxUnhNG9wdHzZGxAuHnozmxII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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