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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92306c09ee42421318f0d5877d194cb204db3a33e174e3a4b9d5d796b23e80d' 
  AND token = '/4EMw+4JrOQtDQSYbOuLggDhpXxJ3kJoUROd2AmTA+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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