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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae43639add968f04be583ccc8e0209628d1254ddb173452d7781961e8e3d9b0' 
  AND token = 'a5d+k736OdnjrEvowgm2V+yMQFcnB0g+AQDIraBUPkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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