SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2488916534bb025fde30f2b16a27c68d450a685a0ddad9b173a6a394fbace1' 
  AND token = 'Ljt/Ik/9OMPddLWYxPxMRyw/cJmqJ1vVtZsFnHsRVHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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