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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee778ea088a54e66c8d623579a7f12eabedbf46f42f4128d8d18ca62499fd35' 
  AND token = '3BJH429SdJLaeDbnOMjlSjSdUwwqmOKynNjr2A342j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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