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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0006df239c3d4768bd0febbd1b262a905e5faa53aa84824b476f7254946ef219' 
  AND token = 'HMjqXq0e3whVx4X/OfTIXuqZyWbZudI93dO6lYTppc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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