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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d910c0baa5e48c0f9ec89200fc921b96d85f66058e4a74aa332ab74f3ef934' 
  AND token = 'BAgdZSeeYBeBdjZfoY8g7QMc5vsu1G9FONvcLY1nPd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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