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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b45031eafe1451eac50048316733c18a338acbddd5b0ceb7545dfb63ae5639' 
  AND token = '5f6NogArAibLFD9hda2kCwAXdj1judBCFss1yoYe2yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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