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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2139b0ceb62b4d62b262de427d4284f94a8ab9a7b9351fd9823ab3afe6c51eaf' 
  AND token = 'otuqCkjU3VnzFxa3r0hSj4exIPwixkXLk9AU68AdxwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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